arch: convert to alias

[Managor]

Checklist

• The page(s) are in the correct platform directories: common, linux, osx, windows, sunos, android, etc.
• The page description(s) have links to documentation or a homepage.
• The page(s) follow the content guidelines.
• The page(s) follow the style guide.
• The PR contains at most 5 new pages.
• The PR is authored by me, or has been human-reviewed if it was created with AI or machine translation software.
• The PR title conforms to the recommended templates.
• Version of the command being documented (if known):
• Reference issue: #

[sebastiaanspeck]

Is it possible to update the translations as well in this PR? I guess the simplest way is to delete all pages.*/common/arch.md, then run scripts/set-alias-page.py and commit the new pages.*/common/arch.md.

[badhon495]

I have reviewed the Bangla documentation. Could you please make these changes? Thank you.

[tldr-bot]

Hello! I've noticed something unusual when checking this PR at commit
dcf142db9f067e073702121df132415828331cb1:

• The page pages.lo/common/arch.md seems to be a copy of pages.lo/common/gh-cs.md (68% matching).
• The page pages.ml/common/arch.md seems to be a copy of pages.ml/windows/cuninst.md (63% matching).
• The page pages.ne/common/arch.md seems to be a copy of pages.ne/windows/cuninst.md (53% matching).
• The page pages.ta/common/arch.md seems to be a copy of pages.ta/windows/cuninst.md (61% matching).
• The page pages.th/common/arch.md seems to be a copy of pages.th/common/clang-cpp.md (69% matching).

Is this intended? If so, just ignore this comment. Otherwise, please double-check the commits.